X-ray tube.



C. E. CAMPBELL.

X-RAY TUBE. APPLlATlON FILED APR. 5. 1913.

Patented July 4, 1916.

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A specincation of Lettersiratnt.

CHARLES E. GAlli-[P18151LL, OF LYNN, MASSACHUSETTS.

Application med Aprn 5, 1913. seriai No. 755,012.

To all whom z'tmay concern.' y

Be it known that I, CHARLES E. CAMP- BELL, a citizen of the United States, residing' at. Lynn, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in' X- Ray Tubes; and l do hereby. declare .the following to be a full,.clear, .and exact description of the invention, such. as will enable others skilled Ain the art to which it appertains to make and use the same.

. of the consists of a solid y cathode rays which are focused by the con-. cathode upon the tungsten 4inset 23.v -The tungsten, very hereinafter ode extension The present invention relates to Rntgen or X-ray tubes. Y v The objects of the present invention are to anord a moreeiiicient support for the.

target and to provide for the dissipatior heat generated at the target.

With the above objects in View, ent invention consists in the X-ray tube described and particularly pointed out inthe claims.

The drawing, which illustrates' the preferred longitudinal section through the X-ray tube.

In the illustrated embodiment of the invention, the.glass X-ray tube has a main part or bulb 1, a target extension 2, a cath- 3'and an' anode extension 4. The cathode .5 is supported opposite the target by a glass Vsleeve 6 conducting rod- 7 which through the sealed-in platinum wire 8 to the cathode connecting ring 9. The anode 10 is supported by surrounds the conducting rod 12'which is connected by the sealed-in platinum Wire 13 to the anode connecting ring 14. A glass liange 20 is formed around thel mouth of the target extension 2 and extends into the bulb portion 1 of the end of the ange 20 isthe target 21 'which' copper block or body 22 with an inset 23 of tungsten in its face. The face of the target is inclined atan angle of about 45 tothe direction of the cave face of he on account vof its high melting point, affords a particularly desirable surface upon which to focus the cathode rays. The targetis supported primarily by means of a sleeve 25 which lits around the internal flan'ge 0. The sleeve 25 is a split tube of springel which fits tightly about and grips both the. copper cathode body 22 and the flange 20 and afthe target.

embodiment of the invention, is -a surrounding the 1s connected a lass sleeve 11 whichv tube. Beyond the 'present invention has been speci fords a very secure and -rigid support for Fitting Within the target extension 2 is a heat conducting sleeve 30.

The sleeve 30 is a split tube of copper which 60 lits lsnugly Within the target. extension 2, extends inside of the flange 20, and fits snugly over thereducedend 31 o the target. The copper isa good conduc r of heat.

Patented July 4., 1916. A.

The heat generated by the target'is cone5 ducted along the' copper sleeve 30 1nto the' target extension 2 Where it is dissipated into the surrounding space. While the target is primarily {supported by the steel-sleeve 25, the copper sleevef() assists in support- 7oing the target. ySurrounding the target extension 2 isan aluminum sleeve 35. The aluminum sleeve v35 absorbs the heat radiated and conducted through the glass tarthe'sleeve 30 and'dissi- 75 get, extension from patesthe heat by radiation and by conduetion to the atmosphere. In order .to provide the most eilicient transfer of heat'from the copper sleeve 30 to the aluminum sleeve 35 and dissipation from the aluminum sleeve 80 35, the heat 'radiating and absorbing surfaces are preferably' blackened. i Thealumnum sleeve 35 1s continued beyond the end y of the target'extension to form a protecting cage 36 for the palladium regulating tube 85 37 The palladium tube 37 is soldered into a short `Iplatirnum sleeve 38 which is sealed through the glass. v To reduce the vacuum i Ain the Rntge ray tube, the palladiumregu- `1s heated 'by extraneous 90 latingk tube 3 means, and releases hydrogen gas tolowe the vacuum. The targetv isfoonnecte through a-conductingrod 40. and the palla-v dium tube 37 to a terminal ring 41.

The targetis primarily supported by the l steelsleeve 25 wh'ch, although not a goed. i p.

heat conductor, furnishes a strong and r1g1dsupport. Theheauconducting sleeve 30 can," therefore,

be made-of 'copper which,v

although mechanicallyweaker than steel, is 1400 a much better heat conductor.

quiring heavy currents.A The tungstenv inset This tube is particularly. adapted for X-ray work reof the particles which make up the-cathode rays and the .heat :from the rigidly supported tar et is readily conducted along the cop-.f per tu ing target extension Where it is dissipated.

While the cally illustrated and described, it is to be understood' e from 'the' bulb into the'heat radiativ preferred' embodiment. of the 110 that the present invention is not limited to its preferred embodiment, but may be embodied in other constructions within the scope of the invention as set forth in the following claimsz- ,Y

l. An X-ray tube having, in combination, a glass bulb, an outwardly extending tubular target extension blown in one side of the bulb, a glass flange around the mouth of the extension integral with the bulb and projecting inwardly therefrom, a target, a supporting sleeve for the target fitting over the flange, and a heat conducting sleeve con nected with the target, entirely inclosed within the X-ray tube and fitting closely against the inside of the target extension so as to dissipate the heat through the glass walls of the target extension, substantially as described.

2. An X-ray tube having, in combination, a glass bulb, an outwardly extending tubular target extension blown in one side of the bulb, a glass flange around the mouth of the extension integral with the bulb and projecting inwardly therefrom, a target, a steel supporting sleeve for the target fitting over the flange and resiliently clasping it, and a heat conducting sleeve connected with the target and fitting inside the extension, substantially as described.

3. An X-ray tube having,

in combination, a glass bulb, an outwardly extending tubular target extension blown in one side of the bulb, a glass flange around the mouth of the extension integral with the bulb 'and projecting inwardly'therefrom, a target, a steel supporting sleeve for the target fitting over the flange and resiliently clasping it, afheat conducting sleeve connected with the target and fitting inside the extension, and a heat dissipating sleeve surrounding the extension, substantially as described.

4. An X-ray tube having, in combination,

5. An X-ray tube having, in combination, i

a glass bulb, an outwardly extending tubular target extension blown in one side of the bulb, a glass flange around the mouth of the extension integral with the bulb and'projecting inwardly therefrom, a target, a heat conducting sleeve extending from the target into the target extension for conducting heat from the target to the target extension, a vacuum regulating tube sealed through the glass at the lend of the target extension, and

a heat dissipating sleeve surrounding ,the targetJ extension and projecting'beyond it to form A"fa protecting cage for the regulating tube, substantially as described.

.6. An X-ray tube havinggin combination,`

a glass bulb, an outwardly extending target extension blown in one side of the bulb, a glass lange around the mouth of the extension integral with the bulb'and projecting inwardly therefrom, a target, a supporting sleeve of resilient material tting over the flange to support the target,and a heat-conducting sleeve connected with the target and fitting inside of the extension, substantially as described.

CHARLES E. CAMPBELL.

Witnesses:

HORACE VAN EVEREN, Geo. E. STEBBINS.'

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